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Упит dcterms_subject_txt:underground excavation

95 items

  • Primena digitalne fotogrametrije u rudniku Rudnik

    Nikola Mirković, Luka Crnogorac, Katarina Urošević (2023)
    Digitalna fotogrametrija, lasersko skeniranje i virtuelizacija sve više pronalaze aktivne uloge u rudarstvu, prvenstveno zbog svoje široke mogućnosti primene. Laserskim skeniranjem i fotogrametrijom snimaju se i kreiraju 3D modeli otkopa, jamskih hodnika, površinskih kopova, površinskih objekata (zgrada, spomenika, predmeta), a vrši se skeniranje celih rudnika koji se rekonstruišu u 3D digitalne modele. Fotogrametrija predstavlja proces fotografisanja objekata pomoću fotoaparata i daljom obradom fotografija u različitim softverskim alatima kreiraju se realne kopije 3D modela objekata ili predmeta u digitalnoj formi. Za ...
    digitalna fotogrametrija, prostorna vizuelizacija, rudarski objekti, podzemna eksploatacija
    ... 109 financial investments of the company), 3D models of underground spaces can be obtained that are at a satisfactory level for the needs of geological mapping in the mine, insight of management and engineers into the state of underground spaces and quality assessment of performed mining works. In ...
    ... P., & Luxbacher, M. (2013). Determination of volumetric changes from laser scanning at an underground limestone mine. Mining Engineering, 65(11) [8] Slaker, B., & Westman, E. (2014). Identifying underground coal mine displacement through field and laboratory laser scanning. Journal of Applied Remote ...
    ... M. (2016). Determination of volumetric changes at an underground stone mine: a photogrammetry case study. International Journal of Mining Science and Technology, 26(1), 149-154 [10] B. A. Slaker, E. C. Westman (2015) Monitoring underground mine displacement using photogrammetry and laser scanning ...

  • Стратешко планирање функционалности подземних просторија моделом прогнозе деформација

    Лука Црногорац (2023)
    Релативно велике деформације подградне конструкције у подземним рудницима угља у Републици Србији представљају један од главних проблема за постизање планиране производње угља. Деформације подграде су директна последица статичких и динамичких оптерећења стенске масе и у многоме зависе и од времена трајања изложености подграде утицају подземног притиска. Код ниско механизованог радног процеса долази до повећаног излагања подземних просторија утицају подземног притиска услед дугог производног циклуса који је често пропраћен застојима у раду. Веома често подземне просторије се санирају и по ...
    подземне просторије, подграда, прогноза деформација, стратешко планирање

  • Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series

    Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)
    Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...
    deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija
    ... Q. Use of the equivalent continuum approach to model the behaviour of a rock mass containing an interlayer shear weakness zone in an underground cavern excavation. Tunn. Undergr. Space Technol. 2015, 47, 35–51. [CrossRef] 2. Armaghani, D.J.; Mohamad, E.T.; Hajihassani, M.; Yagiz, S.; Motaghedi, H ...
    ... in Construction Progress of Tunnel Excavation with Weak Surrounding Rock. Res. J. Appl. Sci. Eng. Technol. 2013, 6, 1497–1503. [CrossRef] 9. Grossauer, K.; Leitner, R.; Schubert, W.; Sellner, P. Prediction of subsidence during tunnel construction. In Underground Space—The 4th Dimension of Metropolises ...
    ... fuzzy time series clusters 1. Introduction Due to hard working conditions and a chronic shortage of money, the underground mining in our country is very a difficult task. Most underground mines are characterized by low mechanized mining methods and production disruptions can happen often. Such mining ...

  • Uniaxial compressive strength test before and after standard fire test on rock mass

    Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)
    ... application of obtained results during the construction of various underground structures and tunnels. If strength of the rock is lower, it will have an impact on the tunnel structure, different measures will be required to ensure the excavation and a larger amount of material needed for construction of ...
    ... not develop as high temperatures in case of fire, as they were in standard fire test. REFERENCES Hoek, E. and Brown, E.T., 1980. Underground excavations in rock. The Institution of Mining and Metallurgy, London. Wittke, W., 2014, Rock Mechanics Based on an Anisotropic Jointed Rock ...

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... conditions (Fig. 2). Bearing inmind that sampleswere collected im- mediately after excavation and kept hermetically closed, the KNN-W2 lignite must have been exposed to in situ oxidative conditions prior to excavation. This may be possible, due to the fact that the Konin deposit is built of a number ...
    ... taking place in the energy market, it is projected that in the short-to-medium term, most lignite-fired power plants will be closed, making lignite excavation unnecessary (Alves Dias et al., 2018). It is expected that this will reduce the scale of anthropogenic GHG emissions, as the coal will no longer ...
    ... there is an important gap in the knowledge that needs to be addressed. The available projections for GHG emissions from closed mines mainly concern underground exploitation. The estimates are based on the current methane bearing capacity and apply Langmuir equa- tions to quantify gas desorption (e.g., Kholod ...

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • Application of Fuzzy Analytic Hierarchy Process to Underground Mining Method Selection

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Vesna Ristić Vakanjac (2020)
    metode podzemne eksploatacije, znanje eksperta, višekriterijumsko odlučivanje, podzemna eksploatacija

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...
    ... informed and intelligent in decision-making, more efficient in operation, safer, and more responsible to society. This paper is focused on the excavation process: ore delineation, development, production and waste management. Design and planning of these processes in the future needs to be closely ...

  • Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке

    Весна Цветков, Илија Васиљевић, Бранислав Сретеновић, Весна Дамњановић (2018)
    ... al Geophysics  is that  it  is non‐destructive, and with the  increase  in  speed and measurement resolution, the costs of the investigation and excavation have decreased consi‐ derably. The use of magnetic measurements in archaeological prospecting allows to obtain the data on  739 the size ...

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Steel Arch Support Deformations Forecast Model Based on Grey–Stochastic Simulation and Autoregressive Process

    Luka Crnogorac, Suzana Lutovac, Rade Tokalić, Miloš Gligorić, Zoran Gligorić (2023)
    Relatively large deformations of the steel arch support in underground coal mines in the Republic of Serbia present one of the main problems for achieving the planned production of coal. Monitoring of the critical sections of the steel arch support in the underground roadways is necessary to gather quality data for the development of a forecasting model. With a new generation of 3D laser scanners that can be used in potentially explosive environments (ATEX), deformation monitoring is facilitated, while ...
    čelična podgrada, prognoza deformacija, vremenske serije, grey-stohastička simulacija, autoregresija, podzemni rudnik uglja

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... weighh usually used laboratory and field tests are those that are common in geotechnical investigations such as: direc field measurements (excavation of exploration pit at the landfili with measurement of volume and weight of excavated waste), measurements on samples from exploration boreholes ...

  • Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia

    Dragoljub Bajić, Dušan Polomčić (2014)
    A groundwater control system was designed to lower the water table and allow the pumping sta-tion “Bezdan 1” to be built. Based on a hydrodynamic analysis that suggested three alternative solutions, mul-ticriteria optimization was applied to select the best alternative. The fuzzy analytic hierarchy process methodwas used, based on triangular fuzzy numbers. An assessment of the various factors that influenced the selec-tion of the best alternative, as well as fuzzy optimization calculations, yielded the “weights” of the alternativesand the ...
    groundwater lowering, groundwater management scenario, fuzzy analytic hierarchy process,expert knowledge, triangular fuzzy numbers, linguistic variables
    ... control system: the number of wells and their spatial distribution, and the time need- ed to achieve maximal lowering of the water table below the excavation for the “Bezdan 1” PS, were defined as follows: • Alternative 1 (A1): Long-term average stages of the canals within the study area (Baračka Canal ...

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... INDUCED BY STRESS CHANGE DUE TO EXCAVATION OF HORIZONTAL UNDERGROUND CHAMBERS ABSTRACT In this dissertation, the aim of the research was to determine the dynamics of seismic events induced by the stress change due to excavation of horizontal underground chambers. The conducted analysis ...
    ... stanja pri izradi horizontalnih podzemnih prostorija;Nonlinear dynamical modeling of seismic events induced by stress change due to excavation of horizontal underground chambers Srđan D. Kostić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Nelinearno dinamičko ...
    ... stanja pri izradi horizontalnih podzemnih prostorija;Nonlinear dynamical modeling of seismic events induced by stress change due to excavation of horizontal underground chambers | Srđan D. Kostić | Универзитет у Београду | 2013-11-04 | | http://dr.rgf.bg.ac.rs/s/repo/item/0003969 Дигитални репозиторијум ...

  • Димензионисање камионског транспорта јаловине на површинском копу Угљевик Исток 1

    Наталија Терзић (2024)
    Напредовањем рударења дошло је до потребе за експлоатацијом сложенијих и сиромашнијих лежишта, самим тим и повећањем трошкова.Профитабилна експлоатација лежишта минералних сировина захтева детаљну анализу свих техничко-економских фактора.Два најутицајнија фактора на профитабилност експлоатације руде јесу откопавање и транспорт, због тога је неопходно направити изводљив стратешки план који ће бити у складу са свим ограничењима и омогућити испуњавање свих планираних резултата.Транспорт на површинским коповима одвија се паралелно са осталим процесима експлоатације, стога је неопходно да сви системи буду усаглашени како не ...
    дисконтинуални транспорт, откривка, транспортне трасе, Тalpac, капацитет, камион, багер
    ... Methodology Discounted Operating Cost Sftonne 0.00 Single Sided Discounted Average Cost Sftonne 0.00 Full Truck Excavation Target tonne 750,000.00 Average for 150 Shifts Time to move Excavation Target Days 134.47 < > \, Productivity_/A, Tyres & Fuel_/, Haul Cycle /A Cash Flow_A Plan / Cnuka 17. Marnej ...
    ... S/tonne .00 Single sided Discounted Average Cost S/tonne 000 FuliTruck xcavatior Target tonme 4.000.000,00 — Average for 150 Shifts Time to move Excavation Target Days 344,08 \Loader Hrs to move Target _ Op.Hour. 4306 Total Truck Hrs to move Target . Op.Hours. zi.530 Total cost to move Target. s ...